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https://github.com/git/git
synced 2024-08-28 12:09:19 +00:00
3c249c9506
This allows the programs to use various simplified versions of the SHA1 names, eg just say "HEAD" for the SHA1 pointed to by the .git/HEAD file etc. For example, this commit has been done with git-commit-tree $(git-write-tree) -p HEAD instead of the traditional "$(cat .git/HEAD)" syntax.
46 lines
888 B
C
46 lines
888 B
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#include "cache.h"
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int main(int argc, char **argv)
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{
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unsigned char sha1[20];
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char type[20];
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void *buf;
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unsigned long size;
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if (argc != 3 || get_sha1(argv[2], sha1))
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usage("cat-file [-t | tagname] <sha1>");
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buf = read_sha1_file(sha1, type, &size);
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if (!buf)
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die("cat-file %s: bad file", argv[2]);
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if (!strcmp("-t", argv[1])) {
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buf = type;
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size = strlen(type);
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type[size] = '\n';
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size++;
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} else if (strcmp(type, argv[1])) {
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die("cat-file %s: bad tag", argv[2]);
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}
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while (size > 0) {
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long ret = write(1, buf, size);
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if (ret < 0) {
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if (errno == EAGAIN)
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continue;
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/* Ignore epipe */
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if (errno == EPIPE)
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break;
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die("cat-file: %s", strerror(errno));
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} else if (!ret) {
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die("cat-file: disk full?");
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}
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size -= ret;
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buf += ret;
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}
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return 0;
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}
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